SCALER_GAMDATA
HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_r[i]);
HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_g[i]);
HVS_WRITE(SCALER_GAMDATA, vc4_crtc->lut_b[i]);